I believe is the answer is D. The block moves to the right. There is more force blowing to the right, so the block will move to the right.
You can find the oxidation number of a certain element in a compound if you add up their oxidation numbers to the net charge. This is just a simple algebraic equation. Let x be the oxidation number of Cr. Since the compound is neutral, the net charge is 0. Thus,
oxidation number for Li: +1
Oxidation number of O: -2
0 = 2(+1) + x + 4(-2)
Solving for x,
x = +6
<em>Thus, the oxidation number of Cr is +6.</em>
Answer:
Option c → Tert-butanol
Explanation:
To solve this, you have to apply the concept of colligative property. In this case, freezing point depression.
The formula is:
ΔT = Kf . m . i
When we add particles of a certain solute, temperature of freezing of a solution will be lower thant the pure solvent.
i = Van't Hoff factor (ions particles that are dissolved in the solution)
At this case, the solute is nonvolatile, so i values 1.
ΔT = Difference between fussion T° of pure solvent - fussion T° of solution.
T° fussion paradichlorobenzene = 56 °C
T° fussion water = 0°
T° fussion tert-butanol = 25°
Water has the lowest fussion temperature and the paradichlorobenzene has the highest Kf. But the the terbutanol, has the highest Kf so this solvent will have the largest change in freezing point, when all the molalities are the same.
Answer:
26.9%
Explanation:
To obtain the percentage by mass of solution, do the following:
Data obtained from the question include:
Mass of HCl (solute) = 36g
Mass of water (solvent) = 98g
Mass of the solution = Mass of solute + Mass of solvent
Mass of the solution = 36 + 98 = 134g
Percentage by mass of the solution = Mass of solute/mass of solution x 100
Percentage by mass of solution = 36/134 x 100 = 26.9%